I took the index of the words, converted the amount to binary, included a few zeros, calculated the sha256 digest, took the first Portion of the hexadecimal to convert it to binary, additional 3 zeros on the eight digits of your binary and obtained 00000010011 which translates to 19 in https://travialist.com/story9009560/little-known-facts-about-bip39-seed-phrase-list